$NOV is one of biggest losers #stocks today. read more:

National Oilwell Varco, Inc. Co (symbol: NOV) was one of the worst losers
of the trading day today (2016-02-03), losing -8.71%. The number of shares
that changed hands was 29,170,687, or about 5 times the average daily
volume in the stock.
The closing price was $28.0, amounting to a market cap of $10,520,000,000,
about -50.56% off the highest price in the last 12 months. The stock has
been trading at a range between $26.1 and $56.64.
NOV is in the Metal Fabrications industry, part of the Energy sector.
Looking at its valuation, the stock is now trading at 8.33 times earnings.